1. Raw material spare
2. Purple sweet potato spare
3. Wash the purple sweet potato, slice and steam
4. Press into purple potato mash, add appropriate amount of butter and sugar and stir evenly
5. Pour the Chinese ingredients into the bread machine
6. Select the "9 and surface" function key button
7. Knead into a uniform dough
8. Select the "15 fermentation" function button
9. Fermented to about 4 times the size
10. Pour the ingredients other than butter in the main dough with the well-developed middle seed
11. Knead until the gluten is extended and the surface is smooth, add softened butter
12. Knead to complete, to pull out a delicate film
13. Place in a warm place, cover with plastic wrap and relax for half an hour. After taking out the loosened dough and ventilating, divide it into 4 parts, and let it relax for 15 minutes after rounding.
14. Roll out the loosened dough into a tongue shape
15. Spread the purple potato filling evenly
16. Then roll up
17. Equal distance into the bucket of the bread machine
18. Select the "15 fermentation" function button again, and finally ferment to 8 minutes full
19. Brush the surface evenly with a layer of egg liquid and evenly sprinkle with sesame seeds
20. The bread machine selects the "19 baking" function button, and the time is set to about 40 minutes. Remove the mold immediately after baking, and let it cool on the grill
